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专利名称：Process for preparing ethylene polymer
composition, particles of ethylene polymercomposition, and film obtained from theparticles of ethylene polymer composition
发明人：Toshiyuki Tsutsui,Tsuneo Yashiki,Yasuo
Funabara
申请号：US10126751申请日：20020422公开号：US06716924B2公开日：20040406
摘要：A process for preparing an ethylene polymer composition comprises a step (I)to prepare an ethylene (co)polymer (i) having [&eegr;] of at least 1.5 times the intrinsicviscosity of a (co)polymer (ii) and a step (II) to prepare an ethylene (co)polymer (ii) having[&eegr;] of 0.3 to 3 dl/g, said steps (I) and (II) using a catalyst containing a componentobtained by contacting a liquid Mg compound with a liquid Ti compound in the presenceof an organosilicon compound, wherein the step (II) is carried out in the presence of thepolymer (i) or the step (I) is carried out in the presence of the polymer (ii), to prepare anethylene polymer composition having [&eegr;] of 1 to 6 dl/g and a density of not lessthan 0.94 g/cm. According to the invention, an ethylene polymer composition (particles)having excellent particle morphology, scarcely suffering sintering and having excellentmoldability, a process for efficiently preparing the particles of ethylene polymercomposition, and a film having small gauge-variation and excellent tear strength can beprovided.
申请人：MITSUI CHEMICALS, INC.
代理机构：Birch, Stewart, Kolasch & Birch, LLP
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